An Experimental Investigation on Structural Behaviour of Beam Column Joint
Naveen Hooda1, Jyoti Narwal2, Bhupinder Singh3, Vivek Verma4, Parveen Singh5

1Naveen Hooda, M.Tech Student, Department of Structural Engineering, Indo Global College of Engineering, Mohali (Punjab), India.
2Jyoti Narwal, M.Tech Student, Department of Structural Engineering, Indo Global College of Engineering, Mohali (Punjab), India.
3Bhupinder Singh, Assistant Professor, Indo Global College of Engineering, Mohali (Punjab), India.
4Vivek Verma, Associate Professor, Indo Global College of Engineering, Mohali (Punjab), India.
5Parveen Singh, M.Tech Student, Department of Structural Engineering, Indo Global College of Engineering, Mohali (Punjab), India.
Manuscript received on 8 August 2013 | Revised Manuscript received on 18 August 2013 | Manuscript Published on 30 August 2013 | PP: 84-88 | Volume-3 Issue-3, August 2013 | Retrieval Number: C1109083313/13©BEIESP
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Abstract: Conventional concrete loses its tensile resistance after the formation of multiple cracks. However, fibrous concrete can sustain a portion of its resistance following cracking to resist more loading. The strength of concrete is appreciably increased by the crack arresting mechanism of the fibres and the ultimate strength is also increased because extra energy is needed to cause fracture of the fibre reinforcing the concrete. Beam-column joints have a crucial role in the structural integrity of the buildings. For this reason they must be provided with adequate stiffness and strength to sustain the loads transmitted from beam and columns. For adequate ductility of beam-column joints, use of closely spaced hoops as transverse reinforcement was recommended. In the present study an attempt has been made to investigate the behaviour of exterior beam-column joint with different detailing of reinforcement, different spacing of connecting ties and with different percentage of steel fibres. Initially three specimens (SP1, SP2 and SP3) with different detailing of reinforcement were tested. Then specimen SP2 was selected for further investigation based on its structural performance and ease of detailing. Two more Specimens were tested with different spacing of ties/stirrups. Finally, to investigate the effect of addition of fibres on behaviour of performance of joints, three specimens (SP6, SP7 and SP8) with volume fractions of 0.5%, 1.0% and 1.5% steel fibres were cast and tested. The results obtained from the investigation indicated that addition of steel fibres in the concrete mix improved structural performance of beam column joints measured in terms of ultimate load carrying capacity, stiffness, crack width, deflection and curvature ductility factor. Steel fibre reinforced concrete is one of the possible alternative solutions for reducing the congestion of transverse reinforcement in beam column joints. Thus with the reduction of congestion of reinforcement in the joint core helps in the ease of construction difficulties, while maintaining ductile behaviour of the frame, With the increase in the percentage of fibres from 0.05% to1.5% in the joint core the deflection and curvature at peak load increased. Specimen SP8 containing 1.5% of steel fibre in the joint core have higher value of rotation (φ), as compared with conventional specimen SP2.This clearly shows that the congestion of reinforcement in the core of beam column joint can be reduced by the addition of steel fibre in the joint core with increase in the spacing of hoops/ties. It was also observed in the study that the deflection and curvature also increases with the decrease in spacing of hoops/tie.
Keywords: Fibre, SP6, SP7.

Scope of the Article: Structural Engineering